their rooms on the fortieth story, care to hear a conference taking place in
the large Hall of the Medical and Surgical Congress Building, they could do
so through the electric receiver that conducts the voice of the lecturer to all
parts of the Tower and of the surrounding buildings where connection is

GROUND PLA.N OK THE TOWER OF PROGRESS

desired. All these palaces, almost adjoining, are nevertheless connected by
rapid underground communication, from centre to centre, from library to
library, etc. Books and small parcels can be despatched at an instant's notice
by pneumatic tubes. The whole structure of the Tower is of steel, stone,
cement and bronze, even book-cases and doors being of these materials, and is
heated from an outside centre which can be regulated according to the demand.
In fact, every modern scientific invention that conduces to comfort, safety